Final answer:
The two ways to recycle scrap aluminum are melting it down and reusing it. Melting down aluminum involves melting the scrap and creating new products while reusing it involves using the scrap in its current form for other purposes.
Step-by-step explanation:
There are two main ways to recycle scrap aluminum: melting it down and remelting it, or reusing it. Melting down aluminum involves collecting scrap aluminum, melting it to its liquid form, and then pouring it into molds to create new aluminum products. This process saves energy and resources as compared to producing new aluminum from raw materials. On the other hand, reusing aluminum involves using the scrap aluminum as it is, without the need for melting or extensive processing. This can be done by repurposing scrap aluminum into new products or using it in construction, for example. Reusing aluminum reduces the need for new aluminum and saves both energy and resources.